Dynamo-electric machine with improved cooling means



V. G. APPLE May 17, 1932.

DYNAMQ ELECTRIC MACHINE WITH IMPROVED COOLING MEANS Filed April 30, 1950 Patented May 17, 1932 PATENT OFFICE VINCENT G. APPLE, OI DAYTON, OHIO DYNAKO-ELECTBIO MACHINE WITH IMPROVED COOLING MEANS Application filed April 80,

This invention relates to dynamo electric machines and particularly to such as are compelled to carry a large percentage of overload resulting in an inordinate amount of heat being generated.

The ob]ect of the invention is to provide a structure having particularly effective facilities for carrying off the heat being generated.

I attain this object by the structure hereinafter described, reference being had to the drawings, wherein- Fig. 1 is a vertical axial sections, taken at 1-1 of Fig. 3, through a motor embodying my invention.

Fig. 2 is an elevation of the motor.

Fig. 3 is a transverse section taken at 33 of Fig. 1.

Fig. 4 is a transverse section taken at 4-4 2 of Fig. 2.

Similar numerals refer to similar parts throughout the several views.

In the embodiment of my invention herein shown and described the armature core 10 is composed of a plurality of laminae 11. Coils 12 are contained in apertures 13 of the core and extend beyond the core at both ends, forming the winding heads 14 and 16. Leads 17 emanate from the front winding head 14 and commutator segments 18 are attached to the leads. An end protecting plate 19 is located at some distance from the ends of the segments.

All of these parts are held in their respective positions by a single mass 21 of insulation, preferably of a kind having as high thermal conductivity as ma be obtained, molded in situ. This mass 0 insulation extends between and about the segments, penetrates the innermost recesses of the winding and fills the interstices between the several turns thereof.

The outer portion of the insulation mass 21 formswr complete coverin 22 over the winding, and, at intervals, ns 23 extend radially outward from the covering. The

fins 23 serve a twofold purpose, the first being to provide an increased area over which the heat drawn from within the mass may be distributed, and the second being to act as 1930. Serial No. 448,648.

fan blades to move air rapidly over the heated areas.

Since the fins 23 are integral parts of the insulation mass 21, and since this mass extends in one continuous piece into the innermost recesses of the coils, through, between and about the individual turns thereof, and between and about the commutator segments, there is naturally provided a continuous path through the mass whereby heat is conducted from the innermost turns of the winding and from the commutator segments to the surfaces of the fins as well as to the surfaces of the covering between the fins, and as the armature rotates the fins move sufiicient air over themselves and over the spaces between them to carry away the heat brought to these surfaces.

The field core 24 composed of laminae 26 has a series of winding apertures 27 around its inner diameter. Coils 28 are wound into apertures 27 and extend beyond the core at both ends, forming the coil heads 29 and 31.

A mass 32 of insulation, preferably of the same kind contained in the mass 21 which forms the armature covering, is molded about the core 24 and coils 28 in the form of a hollow housing adapted to surround the armature structure.

Coils 28 are arranged in two groups 33 30 and 34 (see Fig. 4) to provide a bipolar field winding, and this leaves spaces between the two groups for the openings 36. Of course in a multipolar field a greater number of coil groups, and consequently a greater number of openings 36, will be had. Openings 36 are opposite the fins 23 of the armature and therefore provide outlets for the current of air moved by the fins when the armature rotates.

A hearing head 37 carries two spaced apart bearing bushings 38 in which the armature shaft 39 rotates, the armature being held on theshaft by the nut 41. Air inlet openings 42 in the bearing head 37 and air inlet openings 43 in the housing 32 admit air to the interior of the motor and to the inner ends of the fins, so that during rotation of the armature air is drawn in at openings 42 and 43 and discharged from openings 36.

Since the mass 32 of insulation which forms the field housing also penetrates the turns of the field winding, heat from the in terior of the field winding is rapidly dis tributed throughout the mass, so that currents of air, passing rapid] through openings which are near the win ing in the mass, serve to rapidly remove the heat being generated.

Having described my invention, I claim:

1'. In a dynamo electric machine, a rotating element comprising a winding and an integral mass of insulation of high thermal conductivity extending into the winding between the turns thereof, forming a covering thereover, and extending outwardly beyond the covering to form a series of circumferentially spaced apart fins.

2. In a dynamo electric machine, an armature comprising a winding, a plurality of commutator segments attached to said winding, and an integral mass of insulation of high thermal conductivity extending into the said winding between the turns thereof and forming a covering thereover, and extending between and about the said segments, and outwardly from the said covering to form a series of circumferentially spaced apart fins.

3. In a dynamo electric machine, an armature comprising a magnetizable core having winding apertures, coils in said apertures and extending beyond the ends of the core, leads emanating from said winding, commutator segments attached to said leads, and an integral mass of insulation of high thermal conductivity extending between about said segments, into the said winding between the turns thereof and forming a covering thereover, and extending outwardly from said covering at each end of the core to form En series of circumferentially spaced apart 4. The combination of a structure suchas is defined in claim 1 and a stationary element surrounding said rotating element havin openings communicating with the inner en s of said fins and openings communicating with the outer ends of said fins.

5. The combination of a structure such as is defined in claim 1 and a stationary element comprising a second winding and a mass of similar insulation penetrating and covering said second winding and forming a hollow 7. In the rotatable element of a dynamo electric machine, coils comprising a plurality of turns of insulated wire, and an inte ral mass of insulation of high thermal con uctivity extending into the coils, between the turns thereof and forming a covering thereover and extendin outwardly beyond the covering and there orming a series of spaced apart fins, said fins bein so positioned as to serve the purpose of fan lades for moving a current of air over the outer surfaces of the insulation body.

In testimony whereof I afiix my si ature.

VINCENT G. AP LE. 

